Boasting the most powerful engine in its class, a composite hull that offers sporty handling, plenty of rider-friendly features, and serious value, the Jet Ski® STX®-15F will have you looking for reasons to get out on the water more. It’s the perfect personal watercraft to complement all your summer fun.

160 horsepower* 1,498cc Engine
• Four-stroke engine provides incredibly strong low and mid-range torque
• The most powerful engine in its price range
• Dual overhead cams (DOHC) are light and compact for less valve train inertial mass
• Large valves provide better intake and exhaust flow to improve torque and power
• Intake and exhaust valve lift, as well as cam timing, are optimized to reduce exhaust emissions
• Large capacity airbox cuts down engine noise and provides good air intake flow
• Intake tract designed for maximum performance
• Digital fuel injection provides great throttle response, smooth engine performance, quick acceleration, easy starting and excellent fuel economy
• Tip-over protection shuts engine off if craft tilts more than 61 degrees
• Waterproofed ECU and ignition coils protect the ignition system from electrical shorts
• Unique semi-dry sump oil system lowers the crankshaft in the engine, eliminates the need for scavenging pumps, and keeps the oil from flooding the crankcase if the craft is capsized
• Kawasaki’s patented oil separator provides fail-safe venting for the crankcase and prevents oil from flowing into the intake tract if the craft is capsized
• Has earned a Three-Star Ultra-Low Emissions rating, meets the Environmental Protection Agency’s strictest standards, as well as the California Air Resources Board’s standards *Horsepower measured in PS at the crankshaft under controlled conditions. Actual performance may vary.

Steering System
• Kawasaki Smart Steering® (KSS®) monitors steering input and engine speed and, when certain conditions are met, raises rpm to give enough thrust to maneuver
• Reverse bucket is designed for more precise direction control when backing and is made of injection molded material to prevent corrosion
• Reverse increases maneuverability in tight places

Finding the sweet spot between performance and efficiency isn’t always an easy task. But the Jet Ski® Ultra® LX personal watercraft hits all the right marks. The high-powered PWC is an all-around, go-everywhere cruiser that’ll thrill you with its amazing blend of performance, convenience and functionality. Sharing many parts from its racier 300 series siblings, the Ultra LX has the heart to satisfy your power urges. Think of it as a normally aspirated version of Kawasaki’s supercharged Ultra 300LX and you’ll be on the right track.

Details & Features

Key Features
• Sporty handling and excellent tracking in all water conditions
• Deep-V hull provides better grip for racing-like performance
• Industry-leading storage capacity lets you bring all the gear you need
• Largest fuel tank in class keeps the fun going longer
• Scalloped luxury seat enhances comfort during high-speed cruising
• Five-position adjustable steering adapts to a variety of riders
• Splash deflectors across the bottom of the bow minimize spray in a wide variety of conditions for greater rider concentration
• Retracting rear boarding step makes it easy to climb aboard
160 Horsepower 1,498cc, Four-stroke Engine
• Strong engine provides 160 horsepower2 plus excellent low
• and mid-range torque
• Dual overhead cams (DOHC) are light and compact for less valve train inertial mass
• Four large valves per cylinder provide better intake and exhaust flow for optimum torque and power
• Intake and exhaust valve lift as well as timing are set to reduce exhaust emissions
• Intake tract designed for maximum performance
• Waterproof ECU and ignition coils protect the ignition system from electrical shorts
• Unique semi-dry sump oil system lowers the crankshaft in the engine, eliminates the need for scavenging pumps, and keeps the oil in the sump instead of flooding the crankcase if the craft capsizes
• Large capacity airbox lowers engine noise and improves air intake flow

Fuel Injection
• Large single 60mm throttle body
• Digital fuel injection provides great throttle response, smooth engine performance and quick acceleration, as well as easy starting and excellent fuel economy
• Four-orifice, high-flow fuel injectors provide efficient combustion
155mm Jet Pump
• Large-diameter 155mm jet pump efficiently converts the engine’s horsepower into thrust
• Developed based on feedback from Kawasaki’s race machines, this pump is designed to deliver consistent output and good “bite,” even when riding on rough water
• The large, sophisticated three-blade impeller unit delivers both high speed performance and quiet operation
• Eight-vane intake guide smooths and regulates the flow of water from the impeller for efficient and powerful propulsion
• The reverse lever is on the left side for easy operation while modulating the throttle with the right hand

Composite Hull
• Design incorporates feedback from Kawasaki’s IJSBA championship-winning racing machines for excellent tracking and responsive handling in both calm and rough water conditions
• Delivers the neutral handling and turning characteristics that made Kawasaki Jet Ski® personal watercraft famous, yet the hull enables a high bank angle for motorcycle-like turning performance with reduced side G-loads imposed on riders during turns
• The 22.5-degree V-angle at the bottom of the Ultra® LX’s hull helps prevent spinouts during sharp turns and provides a smoother ride in rough water
• Placing the battery near the center of the machine optimizes weight balance in the hull and frees space inside the engine bay to help maximize storage capacity
• Bottom of the hull slants upward steeply from the center section to the bow, allowing the Ultra LX to penetrate swells and waves with less shock. This allows the hull to push through waves rather than bounce over them at a higher pace
• Integrated sponsons extend from the hull, providing wallow-free straight-line performance and contribute significantly to the Ultra LX’s excellent high-speed maneuverability while helping to retain a narrow hull design

Ride Plate
• Features a groove from the center to the rear of the ride plate that enhances straight-line tracking
Quattro KSD
• The Ultra LX’s Kawasaki Splash Deflector (KSD) uses three bottom-mounted ridges and an additional deflector mounted at the top to deflect water splashing forward from under the hull
• Whether turning or blasting straight ahead at high speeds or low, the Quattro KSD minimizes spray, allowing greater rider concentration

Kawasaki Smart Steering® and Smart Learning Operation Mode
• Kawasaki Smart Steering® (KSS®) monitors steering input and engine speed and, when certain conditions are met, raises rpm to initiate a desired turn, helping new riders better enjoy the performance of this remarkable machine
• Smart Learning Operation (SLO) allows novice riders to become familiar with the handling and response of this Jet Ski watercraft at a more relaxed pace before unleashing the full performance of the Ultra LX
• Two separate keys, one for SLO mode and one for full-power operation, help prevent confusion over which setting is in use

Comfort and Convenience
• Luxury touring seat incorporates specific support areas for the rider and passenger to offer increased confidence and a more relaxing experience
• Five-way adjustable handlebars allow operation while standing or sitting for a wide range of riders
• Ergonomic deck design has plenty of legroom for rider-friendly seating accommodations
• A long rear boarding step makes it easy to climb onboard, and the step retracts inside the bumper to prevent damage
• A quick and easy under-hood hose connection allows easy flushing of sea water out of the engine
• Mirrors mounted on the upper deck facilitate opening of the hatch cover

Capacious Storage
• 60-gallon storage capacity is the largest in its class
• The large-capacity, fully sealed 58-gallon storage area is fitted with a detachable storage tray and has plenty of room for recreational equipment
• Glove box on the center console has a built-in drink holder with space for two drink bottles
• Compact storage area under the rear passenger seat is ideal for small items

Demanding enthusiasts know exactly what they want: the perfect combination of power, handling, and superior luxury. The Jet Ski® Ultra® 300LX personal watercraft delivers all that and more. With luxury manners and serious power, the Ultra 300LX is a PWC enthusiast’s dream, whether your journeys include an easy ride around the lake or an extended ocean cruise. And thanks to world class Kawasaki engineering, the Ultra 300LX will continue to serve you season after season.

Eaton Twin Vortices Series (TVS) Roots-type Supercharger
• Four-lobe design offers significant performance increase over standard roots-type unit
• System force-feeds the engine two liters of air with every revolution, providing a constant supply of high-pressure intake air at all rpm
• Delivers compressed air continuously, not in waves, for smoother power delivery
• Produces large amounts of boost even at low rpm for instant and powerful acceleration right off idle
• Provides a very flat and meaty torque curve with step-free power across the entire rev range without any of the lag associated with turbochargers
• Produces more low rpm boost than competitive or aftermarket systems, with a maximum of 17 psi of boost pressure
• Two different air bypass valves are used to prevent over boosting at low and medium rpm

Air-to-Water Intercooler
• Efficiently cools high-pressure intake air, as cooler air is denser and makes more power
• Cooler air results in higher combustion efficiency and high engine output
• Liquid cooling allows the intercooler to maintain consistent thermal performance

Digital Fuel Injection System
• High-flow fuel injectors with four orifices are fitted for combustion efficiency
• Single throttle body per cylinder features a large, 60mm bore diameter

Exhaust
• 4-into-2-into-1 powerboat-style exhaust system routes the exhaust pipe upward
• Allows the smoothest path for exhaust gases, maximizing exhaust efficiency
160mm Jet Pump
• Efficiently converts the Ultra 300LX’s massive horsepower output into thrust using a 160mm-diameter jet pump
• Developed from Kawasaki’s racing machines, this pump was specially designed to deliver consistent output and good “bite” even when riding on rough water
• Impeller features a 3-blade design that translates the 300X’s engine output into superb acceleration performance and quiet operation
• An eight-vane intake guide is used to smooth and regulate the flow of water from the impeller for efficient and powerful propulsion
• Left-side reverse lever offers easy operation
Ride Plate
• Features a groove from the center to the rear of the plate to enhance straight-line tracking

Electronic Trim Control System
• Allows the angle of the jet pump nozzle to be controlled to adjust the attitude of the hull to suit water surface conditions and riding styles
• Adjustment range is plus or minus 8 degrees from standard
Electronic Throttle Valve (ETV) with Cruise Control
• Accelerator Position Sensor (APS) converts throttle lever input to an electronic signal that’s used to control the throttle valve via an electric motor for optimum throttle response and smoothness
• Redundancy in the system helps ensure control is maintained in case of failure
• One-touch 5 mph mode allows push button no-wake zone riding
• Fuel Economy Assistance mode allows maximum fuel efficiency when going slow
• Economical Riding Indicator mode can be viewed on a graph on the LCD info screen
• Cruise control smoothly holds the 300LX at a set speed from 5 mph up to top speed

Kawasaki Smart Steering®/SLO Mode
• Kawasaki Smart Steering® (KSS®) monitors steering input and engine speed and, when certain conditions are met, raises rpm to help initiate a turn
• Smart Learning Operation (SLO) allows newer riders to become familiar with the handling and response of this JET SKI watercraft at a more relaxed pace
• Two separate keys, one for SLO mode and one for full-power operation, help prevent confusion over which setting is in use
Strong, Light Hull Design
• Feedback from Kawasaki’s IJSBA championship-winning racing machines integrated into design enables it to cope with the engine’s horsepower
• Hull offers a combination of straight tracking and responsive handling in both calm and rough-water conditions
• The lower hull is designed to distribute the engine and power delivery loads over a wide area
• The 300LX’s deep-V hull enables a high bank angle and motorcycle-like turning performance. This reduces the lateral G-loads imposed on riders during turns, allowing them to better concentrate on riding
• The ideal 22.5-degree V-angle at the bottom of the hull helps reduce unwanted spinouts during sharp turns
• Delivers the neutral handling and turning characteristics for which Kawasaki JET SKI watercraft are famous
• The bottom of the hull slants upward steeply from the center section to the bow, so the Ultra 300LX can penetrate swells and waves with less shock, pushing through waves rather than bouncing over them at high speeds
• Integrated sponsons extend from the hull, providing wallow-free straight-line performance and contributing significantly to the 300LX’s excellent maneuverability while helping to retain the narrow hull design

Quattro KSD
• The Ultra 300LX’s Kawasaki Splash Deflector uses three bottom-mounted ridges and an additional deflector mounted at the top to deflect water splashing forward from under the hull
• Whether turning or rocketing forward, at high speeds or low, the Quattro KSD minimizes spray, allowing greater rider concentration

Luxury, Comfort and Convenience
• Five-way adjustable handlebars allow operation while standing or sitting and suit a wide range of riders
• Two-tone LXury seat is ultra comfortable whether riding stand-up, seated or with passengers
• Seat offers roomy accommodations for three people
• Ergonomic deck design gives plenty of legroom
• GPS-mountable handlebar pad accommodates a variety of GPS devices
• A long rear boarding step and dual grab handles make it easy to climb onboard, and the step retracts inside the bumper to prevent damage
• A quick and easy hose connection allows a simple method to flush sea water out of the engine
• Mirrors are mounted to the upper deck to facilitate opening of the hatch cover
Capacious Storage
• The Ultra 300LX offers 60 gallons of total storage capacity
• The large-capacity, fully sealed storage area with a detachable storage tray has plenty of room for recreational equipment
• A detachable drink holder with space for two drink bottles is mounted on the center console
• Ideal for small items like a ski rope, a compact storage area is integrated with the under-seat rear grip
Extra-large Fuel Capacity
• 20.6-gallon fuel tank has more fuel capacity than any machine in its class

Digital Instrumentation
• Highly legible LCD screen
• Instrumentation includes riding modes, as well as external water and air temperature; clock; time, trip and hour meters; tachometer (in digital or graph displays); speedometer and max speed functions
• Eco Indicator shows when the 300LX’s speed and throttle opening is in its most efficient range